Replace startswith with a type check
There are 33 instances of startswith in the current code base, many of them for checking the type of operation. I think it is probably safer to check against the actual type, looking using get_op_from_id or whatever it is called. Apart from the function overhead, this should be about as fast. (If it is a problem one can access the dictionary directly.)
Here is a toy example to show that the performance is about the same. (Runs in ipython.)
In [1]: a = {f"foo{i}": int for i in range(100)}
In [2]: %timeit isinstance(a["foo3"], int)
54.1 ns ± 0.786 ns per loop (mean ± std. dev. of 7 runs, 10,000,000 loops each)
In [3]: %timeit "foo3".startswith("foo")
61 ns ± 0.291 ns per loop (mean ± std. dev. of 7 runs, 10,000,000 loops each)